Parse xsd file to create "structured data model" to show them on "structured data dialog".

Give a wizard page(XSD/WSDL input data selection page) to select a XSD file or WSDL file , and load the "elements" which define in the file.
In the selection page , user need to point out which element is the root element. When finish this wizard page , smooks tools will record the xsd file path
and the root element name in the "smooks-graph-ext" file.

When the user open the "SelectorSelectionDialog" , the smooks tools will parse the infromations recorded in "smooks-graph-ext" and load the xsd file, the root element which point out by user will show on the dialog.